A new casino is coming to my home town but without any tables....

Just a racetrack and slots. I want to know: Are the 'GameMakers' set up to make you loose? These are machines that have BlackJack and Keno and Pick'em Poker and stuff on them. Is playing blackjack on one of these a stupid idea? Or is it the same as playing at a table? With $5 one time I made it up to $30. But I would like to know if that was just a fluke/luck or if these things have real odds/randomness.